Left hand side in Tokyo and Nagoya & Right hand side in Kyoto and Osaka when you are taking escalators.
It's funny because people in Tokyo and Nagoya are stopping on the left hand side when they are walking up/going down in hurry while people in Kyoto and Osaka are stopping on the right hand side of the escalators. There is no regulation, but almost all people follow this kind of rule without notifications.
Shinji
Japan